Besnier, N. (1994).Polynesian gender liminality through time and space. In G.Herdt (Ed.), Third sex, third gender: Beyond sexual dimorphism in culture and history (pp. 285–328). New York: Zone Books.

Birkenfeld-Adams, A. (1998). Quality of attachment in young boys with gender identity disorder: A comparison to clinical and nonreferred control boys. Unpublished doctoral dissertation, York University, Downsview, Canada.

Birkenfeld-Adams, A. (1998). Quality of attachment in young boys with gender identity disorder: A comparison to clinical and nonreferred control boys. Unpublished doctoral dissertation, York University, Downsview,Canada.

Cook, C. (1999). Parental contributions to the aetiology of gender identity disorder: A study of attachment, affect regulation and gender conflict. Unpublished master's thesis, The City College of the City University of New York.

De Cuypere, G., Knudson, G., & Bockting, W. (2010). Response of the World Professional Association for Transgender Health to the proposed DSM 5 criteria for gender incongruence. International Journal of Transgenderism, 12, 119–123.

Meyer-Bahlburg, H. F. L. (2009). Variants of gender differentiation in somatic disorders of sex development: Recommendations for Version 7 of theWorld Professional Association for Transgendered Health’s Standards of Care. International Journal of Transgenderism, 11,226–237.

Vitelli, R., Riccardi, E. (2010). Gender Identity Disorder and Attachment Theory: The Influence of the Patient's Internal Working Models on Psychotherapeutic Engagement and Objective. A Study Undertaken Using the Adult Attachment Interview. International Journal of Transgenderism, 12(4), 241-253.

Walinder, J.(1971), Incidence and sex ratio of transexualism in Sweden. British Journal of Psychiatry, 119, 195-196.

Wallace & Russell (2013) Attachment and Shame in Gender-Nonconforming Children and Their Families: Toward a Theoretical Framework for Evaluating Clinical Interventions, International Journal of Transgenderism, 14:3, 113-126

Weitze C., Osburg S. (1996), Transsexualism in Germany: Empirical data on epidemiology and application of the German Transsexuals' Act during its first ten years. Archives of Sexual Behavior August 1996, Volume 25, Issue 4, pp 409-425.

Weitze, C., & Osburg, S. (1996). Transsexualism in Germany: Empirical data on epidemiology and application of the German Transsexuals’ Act during its first ten years. Archives of Sexual Behavior, 25(4), 409–425.